Saw-sharpening machine



' PATENTED JAN- 5, 1904.

A. ANDERSSDN. SAW SHARPENING MACHINE.

APPLICATION TILED FEB. 5, 1903. H0 MODEL. 2 SHEETS-SHEET 1- PATENTED JAN. 5, 1904.

A; ANDERSSON. SAW SHARPBNING MACHINE.

' 2 SHEETS-SHEET 2.

N0 MODEL.

APPLICATION FILED FEB. 5. 1903.

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Iatented Jane-m 5, 1904.

PATENT OFFICE.

ANDERS ANDERSSON, OF ST. CLOUD, MINNESOTA.

SAW-SHARPENING MACHINE.

SPECIFICATION forming part of Letters Patent No, 748,685, dated January 5, 1904.

Application filed February 5,1903. Serialliu'. 142,087. (No model.)

To asZZ whom it may concern:

Be it known that I, Aspens ANnERssoN, a citizen of the United States, residing at St. Cloud, in the county ofStearns and State of Minnesota, have invented certain new and useful Improvements in Saw-Sharpening-Ma' chines, of which the following is a specification.

This invention consists in certain improvements in the construction of machines for sharpening band and other saws, as hereinafter fully described in connection with the accompanying drawings, in which- Figure 1 is a side elevation of a saw-filing machine constructed in accordance with my invention. Fig. 2 is a top plan view of the Fig. 3 is an end View of the same, showing the saw and its clamping device. Fig. 4 is a vertical transverse section on the line y y of Fig. 1 lookingin the direction of the arrow thereon. Fig. 5 is a vertical transverse section of the machine on the line 2 2: of Fig. 1 lookingin the direction of the arrow thereon. Fig. 6 is a bottom view of the machine detached from its base-support. Fig. 7 is a vertical transverse section of the machine on the line a; m of Fig. 1 looking in the direction of the arrow thereon. Fig. 8 is a perspective view of the saw-feeding pawl.

A is a bed-support upon which the operating-machine is mounted. It may bea tabletop, so as to afford room below it for parts of the mechanism. 1

B, B, and B are standards, in which are formed the bearings for the main horizontal shaft 0, which carries on one end the bevelgear 0. Meshing with said bevel-gear c is another gear e, mounted upon-a vertical shaft E, which receives its power either from the belt-pulley F, if the machine is run by power from a prime mover, or, if run by hand, from a crank G, mounted upon the top of shaft E, said crank having a crank-pin Gi and handle G thereon. The upper portion of the shaft E has its bearingin a horizontal bar B which constitutes a part of the frame and is secured on top of the standards B B B by bolts b A rod g has one end pivotally connected with the crank-pin G and its opposite end pivot-ally connected, by means of a pivoted wrist-pin 2, to the carriage H, which has clamped thereto by means of two hollow bosses h and i a file I.. The carriage consists ofa cylindrical sliding rodJ), received in suitable bearing-boxes 3, secured in the standards B and B. Upon the rod 5 are secured, by means of screw (1, the transverse arms 4. and 5 of the carriage. Said arms are united together adjacent to their outerends by means of a fiat bar S, which rests thereon and is secured thereto by screws a. Thus it will be seen that when the shaft E is rotated the carriage H, which is fastened to the sliding rod 27, is moved backward and forward by the action of the connecting-rod g, and the sawf is advanced at the proper time, as will hereinafter be explained.

The feeding mechanism of the saw maybe described as follows: Mounted on the shaft C, adjacent to the standard B is a cam J, which bears against an arm or projection is of a transverse rod K, which is movably retained in a way In through the instrumentality of a lug k and pin both projecting from the frame of the machine, as shown in Fig. 5. Aspring k bearing against one end of said rod, tends tohold the arm is in engagement with the cam J, and a set-screw is, mounted in the frame at the opposite end of the rod, acts as an adjustment to vary the stroke of the rod in a manner well understood. Said rod K is pivotally connected at its spring-pressed end, as at Z, with a rod L,

which is in turn pivotally mounted in a collar Z borne upon a thumb-stem Z carried by the standard B. Said rod L carries loosely at its opposite end a feeding member or pawl M, which, as shown in Fig. 4, terminates in.

a knife-edge m, adapted for engagement with the teeth of the saw f, the lateral play of said pawl or member M being limited by an arm m, projecting from the standard B. It will thus be observed that as the shaft 0 is rotated the cam J bears against the arm is of rod K, t-herebyimparting motion to the shifting rod L and its pawl M, which latter coming in contact with the teeth of the sawf pushes it forward the space of onetooth. During this action the file I is moved to the left to its limit preparatory to acting upon the saw. Said saw is supported near each end by two angle-plates 6 and 7, adjustably secured to the ends of the standards B by the nub-screws 8. To properly clamp the sides of the saw while the file acts upon it, a cam N is attached to the lower end of the shaft E in a groove formed in the bed-support A, or, if a table is used, it maybe simply on the under side of said table. Said cam during the forward motion of the file comes in contact with the laterally-bent end of a reciprocating rod 0, which is held in position by the bearing-guide 0 at one end and is attached at 0 to the lower end of the saw-clamp M, which is a lever pivoted at n to lugs 92 projecting from the side of the standard B, thus tightening the hold of the clamp at the proper time on the saw. In order to increase the cutting power of the file, pressure is brought to bear upon the file-carriage H by means of an angularly-bent lever P, provided at its upper end with a hollow pendent arm p, within which is placed a shouldered spindle 19 carrying a rollerp bearing upon the flat bar S of the carriage. Around the spindle is placed a coiled spring 10 the lower end of which bears upon the shoulder of the spindle and the upper end against the hollow screw-plug 19 the function of which is to adjust the length of the projecting lower end of said spindle. The lever P is pivotally mounted at 19 upon brackets projecting from the stationary bar 13 When the cam Q, mounted on shaft 0, presses against the end of said bent lever, it causes a downward pressure of the roller 10 upon the bar S of the.

carriage H during the inward stroke of the file, which is the cutting stroke, the side of the saw being then well supported by the standard B of the frame. On the outward stroke of the file the carriage is slightly raised to free the saw from the file and to permit the feeding of the saw, and for this purpose a cam R is so mounted upon the shaft 0 to bear against the underside of an arm 3, pivoted to the standard 13, which arm in turn lifts the bar S of the carriage and raises the latter and the file out of contact with the saw. It will be apparent that the bar S, sliding on the standards B B, prevents the file from cutting deeper or at a different angle from what is intended. This entire action is performed at every revolution of the shaft E and for each tooth of the saw operated upon.

It will be obvious to those skilled in the art to which the invention relates that modifications may be made in details without departing from the spirit and scope of the same. Hence I do not limit myself to the precise construction and arrangement ofparts hereinabove set forth and illustrated in the accompanying drawings; but,

Having described the nature and objects of sire to secure by Letters Patent, is

1. The combination of the frame of the machine, the file-carrying carriage hinged thereto, said carriage having a slidable cylindrical rod and fiat bar S lengthwise thereof and transverse arms uniting them, a shaft 0 parallel with the hinge-rod of said carriage, a cam upon said shaft, a pivoted angular lever having one end in engagement with said cam and in its other end a spring-pressed roller resting upon the bar S, and means for intermit tingly raising said bar S,substantially as described.

2. The combination of the frame of the machine, the file-carrying carriage hinged thereto, said carriage having a slidable cylindrical rod and fiat bar S length wise thereof and transverse arms uniting them, a shaft C parallel with the hinge-rod of said carriage, a spring-pressed lever movable transversely of said frame, a pawl-carrying lever operatively connected with said first-mentioned lever, a cam upon said shaft for advancing said firstnamed lever, and means for exerting pressure upon the bar S, and means for intermittingly raising said bar S, substantially as described.

3. The combination of the frame of the machine, the file-carrying carriage hinged thereto having a slidable cylindrical hinge-rod and a flat bar S lengthwise thereof, a shaft 0 parallel with the hinge rod, a cam upon said shaft, a pivoted lever resting upon said cam and adapted to bear against the under side of the bar S, and intermittingly raise one side of the carriage, and means for depressing said bar S, substantially as described.

4. The combination of the frame of the machine, the file-carrying carriage hinged thereto, a slidable cylindrical rod lengthwise of said carriage constituting the hinge-rod of said mo shaft, a saw-advancing pawl, means to carry 105 said pawl, a lever for operating the pawl-carrying means, a cam upon the horizontal shaft to advance said lever in one direction and a spring to retract it, substantially as described.

In testimony whereof I affix my signature no in presence of two witnesses.

ANDERS ANDERSSON.

Witnesses:

JOHN A. PEARSON, ANDREW C. ROBERTSON. 

